We all know about the supervolcano boiling underneath Yellowstone – but, until now, we didn’t know what was fueling the cauldron. This week, scientists revealed that they were able to model the behavior of two magma chambers underground by using supercomputer technology. At one point, these two magma lakes almost meet, forming a slab of pressure-trapping rock. That rock could be the powder keg that fuels the volcano.

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University of Oregon geologist Ilya Bindeman and his team ran simulations based on research from the University of Utah, which had determined that two gigantic magma chambers lay underneath Yellowstone. Bindeman’s simulations showed how those magma chambers formed over the course of 7 million years.

Using these models, researchers determined that a cooler magma shelf is crushed between the two magma bodies about six miles below the surface. This so-called “gabbro rock” is found in other supervolcanoes around the world. Someday, scientists will be able to use this information to help shed a little light on how and when the Yellowstone volcano might blow, as well as what feeds it.

Related: NASA considers puncturing Yellowstone supervolcano to save life on Earth

“This is the nursery, a geological and petrological match with eruptive products. We think that this structure is what causes the rhyolite-basalt volcanism throughout the Yellowstone hotspot, including supervolcanic eruptions,” said Bindeman. The study was published this week in Geophysical Research Letters.

+ Geophysical Research Letters

Via Science Alert

Images via Deposit Photos and GRL